Voltage Range - Equinox Systems EPSILON5 MKII User Manual

Distributor of Equinox Technologies: Excellent Integrated System Limited
Datasheet of EPSILON5-A1 - ISP PORTABLE PROGRAMMER USB
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1.5.2 Voltage range

The programmer is designed to operate from a supply voltage in the range defined in the table below.
Correct operation outside of these limits is not guaranteed. The programmer supply voltage can be
derived from either the CON1 connector or the Target Vcc pin on any of the ISP Headers. The
CON1 centre pin and the Target Vcc are physically joined together inside the programmer if the
jumper J9 is fitted.
Fig. 1.5.2 Programmer voltage supply range for reliable operation
# Programmer mode
1 Programming a Target Device
2 Uploading Programming Projects to programmer FLASH
Important note:
The programmer electronics should operate reliably between the 'Min Vcc' and 'Max Vcc' voltage
levels specified in the table above. This does NOT mean that every Target Device can also be
programmed within this voltage range.
To verify that a particular device can be programmed at a certain Vcc voltage:
•
Check the supply / programming voltage parameters for the actual device (IC) in the
manufacturer's datasheet.
•
Many devices have two different voltage range versions eg. 2.7 – 6.0V and 4.0 – 6.0V.
Please ensure that you are programming the device within the stated voltage range.
•
Ensure that you have selected the required Target Vcc Voltage in your EQTools –
Programming Project (*.ppm).
e.g. if you are programming at +3.3V, you must set up this voltage in your Programming
Project. This can be found in the EQTools - Project Builder <Target Vcc> tab.
•
For most Atmel AVR and AT89S devices, the FLASH and EEPROM Write Times increase as
the Target Voltage decreases. The timings are automatically set for you in your project as
long as you have declared the correct Target Vcc voltage in your project.
8
EPSILON5 MKII Programmer - User Guide V1.12 – 1
Min Max Units
Vcc Vcc
3.05 5.00 V
3.10 5.00 V
st
August 2007